Transmission gear arrangement

Abstract

The present gear arrangement for an automatic transmission includes one compound planetary gear unit and two simple planetary gear units. Three clutches and three brakes are selectively engaged to produce five forward and two reverse drive ratios.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
       1. A power transmission providing a plurality of forward and reverse drive ratios, comprising: (a) input means for delivering power;   (b) first selectively engageable clutch means operatively connected to the input means;   (c) output means for delivering power from the transmission;   (d) compound planetary gear means drivingly connected to the input means;   (e) first and second simple planetary gear means drivingly connected to the first clutch means;   (f) second and third selectively engageable clutch means drivingly connected to the compound planetary gear means and operatively connected to the first simple planetary gear means;   (g) means drivingly connecting the first and second simple planetary gear means;   (h) means drivingly connecting the second simple planetary gear means and the output shaft; and   (i) selectively engageable brake means cooperating with the compound planetary gear means; the first and second simple planetary gear means and the second and third clutch means to establish selected drive ratios.   
     
     
       2. The power transmission specified in claim 1 wherein the compound planetary gear means includes: (a) an input ring gear drivingly connected to the input means;   (b) a first set of pinion gears meshed with the input ring gear;   (c) a second set of pinion gears meshed with the first set;   (d) an output ring gear meshed to the second set of pinion gears;   (e) a sun gear meshed with the second set of pinion gears; and   (f) a planetary carrier for rotatably supporting the first and second sets of pinion gears.   
     
     
       3. The power transmission specified in claim 2 wherein: (a) the output ring gear is operatively connected to the first simple planetary gear means through the second clutch means; and   (b) the sun gear is operatively connected to the first simple planetary gear means through the third clutch means.   
     
     
       4. The power transmission specified in claim 3 wherein the brake means includes: (a) a first brake for engaging the planetary carrier of the compound planetary gear means;   (b) a second brake for engaging a member of the first simple planetary gear means; and   (c) a third brake for engaging a member of the second simple planetary gear means.   
     
     
       5. The power transmission as specified in claim 4 wherein the second and third clutch means are operatively connected to the second brake. 
     
     
       6. A gear arrangement for a power transmission, comprising: (a) input means for delivering power;   (b) first selectively engageable clutch means operatively connected to the input means;   (c) output means for delivering power from the transmission;   (d) first planetary gear means for selectively establishing drive ratios within the transmission including (i) an input ring gear drivingly connected to the input means,   (ii) a first set of pinion gears meshed with the input ring gear,   (iii) a second set of pinion gears meshed with the first set,   (iv) an output ring gear meshed with the second set of pinion gears,   (v) a sun gear meshed with the second set of pinion gears, and   (vi) a planetary carrier for rotatably supporting the first and second sets of pinion gears;     (e) second planetary gear means for selectively establishing drive ratios within the transmission including a first member drivingly connected to the first clutch means;   (f) third planetary gear means for selectively establishing drive ratios within the transmission including a first member drivingly connected to the first clutch means;   (g) first brake means for selectively engaging the planetary carrier of the first planetary gear means;   (h) second brake means for selectively engaging a second member of the second planetary gear means;   (i) second clutch means for selectively engaging the output ring gear with the second member of the second planetary gear means;   (j) third clutch means for selectively engaging the sun gear with the second member of the second planetary gear means;   (k) third brake means for engaging a second member of the third planetary gear means;   (l) means drivingly connecting the second and third planetary gear means; and   (m) means drivingly connecting the third planetary gear means with the output means.   
     
     
       7. The gear arrangement specified in claim 6 wherein: (a) a first forward speed reduction ratio is established by engaging the second clutch means and the first and third brake means;   (b) a second forward speed reduction ratio is established by engaging the first and second clutch means and the third brake means;   (c) a third forward speed reduction ratio is established by engaging the first and second clutch means and the first brake means;   (d) a fourth forward speed reduction ratio is established by engaging the first and second clutch means and the second brake means;   (e) a fifth forward speed ratio is established by engaging the first, second and third clutch means;   (f) a first reverse speed reduction ratio is established by engaging the second and third clutch means and the third brake means; and   (g) a second reverse speed reduction ratio is established by engaging the third clutch means and the first and third brake means.